Tandem ring-closing metathesis–radical cyclization based on 4-(phenylseleno)butanal and methyl 3-(phenylseleno)propanoate — a route to bicyclic compounds
Efficient and convenient oxidation of aldehydes and ketones to carboxylic acids and esters with H<sub>2</sub>O<sub>2</sub> catalyzed by Co<sub>4</sub>HP<sub>2</sub>Mo<sub>15</sub>V<sub>3</sub>O<sub>62</sub> in ionic liquid [TEBSA][BF<sub>4</sub>]
作者:Yu-Lin Hu、De-Jiang Li、Dong-Sheng Li
DOI:10.1039/c5ra02234g
日期:——
A simple, efficient, and eco-friendly procedure for the oxidation of aldehydes and ketones to carboxylic acids and esters with H2O2 catalyzed by Co4HP2Mo15V3O62 in ionic liquid [TEBSA][BF4] has been developed.
The potential of the oxy-Favorskii rearrangement to form branched cis-fused bicyclic ethers was explored. Both tertiary and quaternary centers were constructed in highly stereospecific manners. Methanol and primary amines were effective nucleophiles for the rearrangement. The total synthesis of (±)-communiol E was achieved based on this method.
Heterogeneous Baeyer–Villiger oxidation of ketones using an oxidant consisting of molecular oxygen and aldehydes in the presence of hydrotalcite catalysts
作者:Kiyotomi Kaneda、Shinji Ueno、Toshinobu Imanaka
DOI:10.1039/c39940000797
日期:——
Hydrotalcites catalyse BaeyerâVilliger oxidation of ketones using a combination oxidant system of molecular oxygen and benzaldehyde to give high yields of lactones and esters at 40 °C.
Supported Sulfonic Acid as Green and Efficient Catalyst for Baeyer-Villiger Oxidation with 30% Aqueous Hydrogen Peroxide
作者:Calogero G. Piscopo、Stefan Loebbecke、Raimondo Maggi、Giovanni Sartori
DOI:10.1002/adsc.201000076
日期:——
Silica‐supported propylsulfonic acid is a very good heterogeneous catalyst for the Baeyer–Villigeroxidation of cyclic ketones to lactones with stoichiometric 30% aqueous hydrogenperoxide in 1,1,1,3,3,3‐hexafluoro‐2‐propanol as solvent.
A short asymmetric synthesis of methyl 2-((1S,3R)-3-((tert-butyldiphenylsilyl)oxy)cyclopentyl)acetate from norbornene
作者:Buwen Huang、Jeff Elleraas、Jason Ewanicki、Scott C. Sutton
DOI:10.1016/j.tetlet.2020.152057
日期:2020.7
Methyl 2-((1S,3R)-3-((tert-butyldiphenylsilyl)oxy)cyclopentyl)acetate has been synthesized from norbornene using Hayashi’s (S)-MOP Pd-catalyzed asymmetric hydrosilation. On a 1 mol scale, asymmetric hydrosilation of norbornene afforded an 84:16 exo- to endo-norborneol mixture but with exclusive 1R,4S-stereochemistry at the bridgehead carbons. The norborneol mixture was converted to an optically pure